Ad-hoc HF time frequency diversity

Abstract

A high-frequency beyond line of sight ad-hoc communication system is disclosed. In embodiments, the system includes an originating node. The originating node is configured to transmit a transmission. In, the system includes a destination node. The destination node is configured to receive the transmission using one or more antennas. In, the system includes one or more relay nodes, which are configured to relay the transmission from the operating mode to the destination mode in a time diverse manner. The relay nodes further comprise a controller, configured to facilitate high-frequency beyond line of sight communication between the originating node and the destination node, wherein the transmission is carried in accordance with a TDMA based waveform that supports frames and time slots. In embodiments, the one or more relay nodes are further configured to relay the transmission from the originating mode to the destination mode in a frequency diverse manner.

What is claimed is: 
     
       1. A high-frequency beyond line of sight ad-hoc communication system comprising:
 an originating node, configured to transmit a transmission, wherein the transmission is configured for skywave communication; 
 a destination node, configured to receive the transmission using a single destination antenna; 
 a plurality of relay nodes, wherein two or more relay nodes of the plurality of relay nodes are configured to directly receive the transmission from the originating node, and relay the transmission to the destination node in a time diverse manner and a frequency diverse manner, with each of the two or more relay nodes using a single antenna, each relay node comprising a controller configured to facilitate high-frequency beyond line of sight communication between the originating node and the destination node, wherein the transmission is carried in accordance with a time division multiple access (TDMA) based waveform that supports frames and time slots, wherein the frequency of the transmission is in a range of 2 MHz to 30 MHz. 
 
     
     
       2. The system of  claim 1 , wherein at least one of the two or more relay nodes are further configured to relay the transmission from the originating node to the destination node in a polarization diverse manner. 
     
     
       3. The system of  claim 1 , wherein the originating node is further configured to optimize at least one of packet coding or slot length to increase transmission bit rates. 
     
     
       4. The system of  claim 1 , wherein the originating node is further configured to repeat data from one time slot to another time slot within a same frame. 
     
     
       5. The system of  claim 1 , wherein at least one of the two or more relay nodes are further configured to at least one of receive a transmission from a relay node or retransmit a transmission to the relay node. 
     
     
       6. The system of  claim 1 , wherein at least one of the two or more relay nodes are further configured to perform selective interference cancellation to decode two or more simultaneous signals. 
     
     
       7. A high-frequency beyond line of sight ad-hoc communication system comprising:
 an originating node, configured to transmit a transmission, wherein the transmission is configured for skywave communication; 
 a destination node, configured to receive the transmission using a single destination antenna; and 
 a plurality of relay nodes, wherein two or more relay nodes of the plurality of relay nodes are configured to receive the transmission from the originating node, and relay the transmission to the destination node in a frequency diverse manner, with each of the two or more relay nodes using a single antenna, each relay node comprising a controller configured to facilitate high-frequency beyond line of sight communication between the originating node and the destination node, wherein the transmission is carried in accordance with a time division multiple access (TDMA) based waveform that supports frames and time slots, wherein the frequency of the transmission is in a range of 2 MHz to 30 MHz. 
 
     
     
       8. The system of  claim 7 , wherein at least one of the two or more relay nodes are further configured to relay the transmission from the originating node to the destination node in at least one of a time diverse or spatially diverse manner. 
     
     
       9. The system of  claim 7 , wherein at least one of the two or more relay nodes are further configured to relay the transmission from the originating node to the destination node in a polarization diverse manner. 
     
     
       10. The system of  claim 7 , wherein the originating node is further configured to optimize at least one of packet coding or slot length to increase transmission bit rates. 
     
     
       11. The system of  claim 7 , wherein the originating node is further configured to repeat data from one time slot to another time slot within a same frame. 
     
     
       12. The system of  claim 7 , wherein at least one of the two or more relay nodes are further configured to at least one of receive a transmission from a relay node or retransmit a transmission to the relay node. 
     
     
       13. The system of  claim 7 , wherein at least one of the two or more relay nodes are further configured to perform selective interference cancellation to decode two or more simultaneous signals. 
     
     
       14. The system of  claim 7 , wherein the system is further configured to utilize at least one of space-time block coding or space-time frequency block coding. 
     
     
       15. The system of  claim 1 , wherein the system utilizes a predicted propagation of HF signals to determine a selection of at least one of the two or more relay nodes. 
     
     
       16. The system of  claim 7 , wherein the system utilizes a predicted propagation of HF signals to determine a selection of at least one of the two or more relay nodes.